But whales communicate better through ultrasonic sounds than through human-audible sounds, especially underwater, "he explained."

但与人耳可听见的声音相比，鲸鱼更‘擅长’用超声波交流，尤其是在水下。

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Doctors know that it's not unusual for drowning victims-especially ones who have been underwater for about 20 minutes or less, as Ostrander was-to survive and fully recover.

医生们都知道对于一个溺水者，特别是在水下的时间少于20分钟的时候，就像Ostrander这样的情况，幸存下来并完全康复并不少见。

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Central to the case against bottom-fishing is the protection of underwater mountains, known as seamounts, which are especially rich in Marine life of all kinds.

海底拖网捕捞招致抗议的核心原因来自对水下山脉的保护。这些被称为海山的水下山脉中栖息有极其丰富的各种水生生物。

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Since home equity is the largest source of wealth for most Americans, young households were especially hard hit, as many are now underwater on their homes.

FORBES: Wealth Inequality Between Young and Old Generations Reaches Record High

Scour: removal of underwater material by waves or currents, especially at the toe of a shore protection structure.

UNESCO: L O S S A R Y

Central to the case against bottom-fishing is the protection of underwater mountains, known as seamounts, which are especially rich in marine life of all kinds.

ECONOMIST: Marine conservation